javaFX系列：史上最简单的javaFX视频播放器实现

2023-11-11 08:36| 来源: 网络整理| 查看: 265

前言

本章接着之前的根据组件学习javaFX的系列教程，本章为javaFX视频播放器的简单实现。

javaFX结构组件

场景图（Scenen graph）图形系统（Graphics System） Glass窗体工具包（Glass window toolkit）多媒体和图形（media and images） web组件（web component） css样式 UI控件（UI controls）布局（layout）视觉特效（visual effects）

参考

本章有且只参考了oracle javaFX官方文档： https://docs.oracle.com/javase/8/javafx/media-tutorial/overview.htm#JFXMD101

功能实现

完整的视频播放功能开始播放停止播放暂停播放音量调整播放进度调整

实现代码

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public String src;//播放地址 public JavaFxVideoPlayer() { Console.log("创建"+this.getClass().getSimpleName()+"对象，顺序：2，当前线程： "+Thread.currentThread().getName()); } private void load(String src) { Console.log("初始化播放器，播放器播放地址："+src); this.mc = new MediaCtrl(createMediaPlayer(src)); this.scene=new Scene(mc,sceneWidth,sceneHeight); } @Override public void init() throws Exception { src=getParam("src"); String width=getParam("width"); String height=getParam("height"); sceneWidth=Integer.valueOf(width); sceneHeight=Integer.valueOf(height); load(src); //与对象创建，start，stop方法不属于同一个线程 Console.log("执行了init初始化"+this.getClass().getSimpleName()+"，顺序：3，当前线程： "+Thread.currentThread().getName()); // init方法是由javaFX-launcher线程执行的，也就是说，init中的初始化的数据，在start中使用可能会发生空指针 super.init(); } @Override public void stop() throws Exception { // TODO Auto-generated method stub Console.log("执行stop销毁"+this.getClass().getSimpleName()+"对象，顺序：5，当前线程： "+Thread.currentThread().getName()); super.stop(); } @Override public void start(Stage primaryStage) throws Exception { Console.log("初始化场景大小："+sceneWidth+"x"+sceneHeight); //mc.videoWidth==null?sceneWidth:mc.videoWidth,mc.videoHeight==null?sceneHeight:mc.videoHeight Console.log(this.getClass().getSimpleName()+"开始显示窗口，顺序：4，当前线程："+Thread.currentThread().getName()); primaryStage.setTitle("eguid最简单的javaFX播放器demo"); primaryStage.setScene(scene); primaryStage.setAlwaysOnTop(true);//窗口永远在最上层 primaryStage.requestFocus();//窗口获取焦点 primaryStage.setFullScreen(false);//全屏 // primaryStage.setOpacity(50);//透明度 primaryStage.setResizable(false);//窗口是否可调整大小 primaryStage.sizeToScene();//窗口大小适应场景大小 primaryStage.show();//显示，必须设置scene场景后才能调用 } /** * 添加显示组件 */ private void addView(Node node) { ((Group)scene.getRoot()).getChildren().add(node); } /** * 创建播放器窗口 * @param mediaPlayer * @return */ private MediaView createSimpleMediaPlayerView(MediaPlayer mediaPlayer) { MediaView view =new MediaView(mediaPlayer); view.setCache(false);//是否缓存 return view; } /** * 创建播放器 * @param src * @return */ private MediaPlayer createMediaPlayer(String src) { Media media=new Media(src);//创建媒体 //创建媒体播放器 MediaPlayer player=new MediaPlayer(media); //设置自动播放 // player.setAutoPlay(false);//默认是否自动播放 return player; } /** * 获取输出参数 * @param key * @return */ private String getParam(String key) { Map params=getParameters().getNamed(); return params.get(key); } static class MediaCtrl extends BorderPane{ public MediaPlayer mp;//播放器 public MediaView mv;//播放器显示组件 public HBox mb;//播放器控制面板 public Slider ts;//进度条 public Label pt;//播放时间显示 public Slider vs;//音量控制条 public Button playButton;//播放按钮 public Button stopButton;//停止按钮 public final boolean repeat = false;//循环播放 public boolean stopRequested = false; public boolean atEndOfMedia = false;//媒体播放是否结束 public Duration duration;//持续时长 public Integer videoWidth,videoHeight;//视频画面实际大小 public MediaCtrl(final MediaPlayer mp) { this.mp=mp; setStyle("-fx-background-color:#bfc2c7"); mv=new MediaView(mp); Pane mvPane = new Pane(); mvPane.getChildren().add(mv); mvPane.setStyle("-fx-background-color: black;"); setCenter(mvPane); BorderPane.setAlignment(mv, Pos.CENTER); //播放器控制面板 mb = new HBox(); mb.setAlignment(Pos.CENTER);//设置对齐方式：中间对齐 mb.setPadding(new Insets(5, 10, 5, 10));//设置内边距 BorderPane.setAlignment(mb, Pos.CENTER);//设置对其方式：中间对齐 //停止按钮 stopButton = new Button(""); mb.getChildren().add(stopButton); setBottom(mb); Label spacer = new Label(" "); mb.getChildren().add(spacer); //播放|暂停按钮 playButton = new Button("?"); mb.getChildren().add(playButton); setBottom(mb); Label spacer2 = new Label(" "); mb.getChildren().add(spacer2); //显示播放进度label Label timeLabel = new Label("播放进度: "); mb.getChildren().add(timeLabel); // 时间进度条 ts = new Slider(); HBox.setHgrow(ts,Priority.ALWAYS); ts.setMinWidth(50); ts.setMaxWidth(Double.MAX_VALUE); mb.getChildren().add(ts); pt = new Label(); pt.setPrefWidth(130); pt.setMinWidth(50); mb.getChildren().add(pt); // 显示音量Label Label volumeLabel = new Label("音量: "); mb.getChildren().add(volumeLabel); // 音量条 vs = new Slider(); vs.setPrefWidth(70); vs.setMaxWidth(Region.USE_PREF_SIZE); vs.setMinWidth(30); mb.getChildren().add(vs); initListeners(); } private void initListeners(){ stopButton.setOnAction(new EventHandler() { @Override public void handle(ActionEvent event) { Console.log("停止播放"); mp.stop(); stopRequested = true;//播放结束 playButton.setText("?"); } }); //监听播放状态 playButton.setOnAction(new EventHandler() { @Override public void handle(ActionEvent event) { Status status = mp.getStatus(); Console.log("当前播放状态："+status); if (status == Status.UNKNOWN || status == Status.HALTED){ // don't do anything in these states return; } if (status == Status.PAUSED || status == Status.READY || status == Status.STOPPED){ // rewind the movie if we're sitting at the end if(stopRequested) { //已停止播放，不允许再播放 return; } Console.log("播放"); if (atEndOfMedia) { Console.log("播放结束，调整播放进度条"); mp.seek(mp.getStartTime()); atEndOfMedia = false; } mp.play(); } else { Console.log("暂停"); mp.pause(); } } }); //监听播放时间 mp.currentTimeProperty().addListener(new InvalidationListener() { @Override public void invalidated(Observable observable) { // TODO Auto-generated method stub updateValues(); } }); //监听设置播放操作 mp.setOnPlaying(new Runnable() { public void run() { if (stopRequested) { mp.pause(); stopRequested = false; } else { playButton.setText("||"); Media media=mp.getMedia(); videoWidth=media.getWidth(); videoHeight=media.getHeight(); Console.log("视频画面大小："+videoWidth+"x"+videoHeight); double width=getScene().getWidth(); double height=getScene().getHeight(); Console.log("实际窗口大小："+width+"x"+height); double scaleX=width/videoWidth+1,scaleY=(height-60)/videoHeight+1; Console.log("调整视频缩放，以适应窗口实际尺寸，缩放等级："+scaleX+"x"+scaleY); mv.setScaleX(scaleX); mv.setScaleY(scaleY); mv.setSmooth(true); mv.setTranslateX(width/videoWidth/2); mv.setTranslateY(height/videoHeight/2); } } }); //监听暂停操作 mp.setOnPaused(new Runnable() { public void run() { System.out.println("onPaused"); playButton.setText("?"); } }); //监听视频开始加载状态 mp.setOnReady(new Runnable() { public void run() { Media media=mp.getMedia(); duration = media.getDuration(); updateValues(); } }); mp.setCycleCount(repeat ? MediaPlayer.INDEFINITE : 1); mp.setOnEndOfMedia(new Runnable() { public void run() { Console.log("播放结束"); if (!repeat) { playButton.setText("?"); stopRequested = true; atEndOfMedia = true; } } }); //监听时间进度条 ts.valueProperty().addListener(new InvalidationListener() { public void invalidated(Observable ov) { if (ts.isValueChanging()) { // multiply duration by percentage calculated by slider position mp.seek(duration.multiply(ts.getValue() / 100.0)); } } }); //监听音量设置 vs.valueProperty().addListener(new InvalidationListener() { public void invalidated(Observable ov) { if (vs.isValueChanging()) { mp.setVolume(vs.getValue() / 100.0); } } }); } /** * 更新时间 */ protected void updateValues() { if (pt != null && ts != null && vs != null) { Platform.runLater(new Runnable() { public void run() { Duration currentTime = mp.getCurrentTime(); pt.setText(formatTime(currentTime, duration)); ts.setDisable(duration.isUnknown()); if (!ts.isDisabled() && duration.greaterThan(Duration.ZERO)&& !ts.isValueChanging()) { ts.setValue(currentTime.divide(duration).toMillis()* 100.0); } if (!vs.isValueChanging()) { vs.setValue((int)Math.round(mp.getVolume() * 100)); } } }); } } private static String formatTime(Duration elapsed, Duration duration) { int intElapsed = (int)Math.floor(elapsed.toSeconds()); int elapsedHours = intElapsed / (60 * 60); if (elapsedHours > 0) { intElapsed -= elapsedHours * 60 * 60; } int elapsedMinutes = intElapsed / 60; int elapsedSeconds = intElapsed - elapsedHours * 60 * 60 - elapsedMinutes * 60; if (duration.greaterThan(Duration.ZERO)) { int intDuration = (int)Math.floor(duration.toSeconds()); int durationHours = intDuration / (60 * 60); if (durationHours > 0) { intDuration -= durationHours * 60 * 60; } int durationMinutes = intDuration / 60; int durationSeconds = intDuration - durationHours * 60 * 60 - durationMinutes * 60; if (durationHours > 0) { //Compile and Run the EmbeddedMedia //Controlling Media Playback 3-7 return String.format("%d:%02d:%02d/%d:%02d:%02d", elapsedHours, elapsedMinutes, elapsedSeconds,durationHours, durationMinutes, durationSeconds); } else { return String.format("%02d:%02d/%02d:%02d", elapsedMinutes, elapsedSeconds,durationMinutes, durationSeconds); } } else { if (elapsedHours > 0) { return String.format("%d:%02d:%02d", elapsedHours, elapsedMinutes, elapsedSeconds); } else { return String.format("%02d:%02d",elapsedMinutes, elapsedSeconds); } } } } } 运行代码 1234567public static void main(String[] args) { Console.log("进入main方法，顺序：1，当前线程："+Thread.currentThread().getName()); //https://media.w3.org/2010/05/sintel/trailer.mp4 //http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4 Application.launch(JavaFxVideoPlayer.class,new String[]{"--width=1280","--height=720","--src=http://localhost:81/big_buck_bunny.mp4"}); Console.log("结束main方法，顺序：6，当前线程："+Thread.currentThread().getName()); }

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